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   The discovery of homodinuclear multiple bonds composed of Group 13 elements represents one of the most challenging frontiers in modern chemistry. A classical triple bond such as N≡N and HC≡CH contains one σ bond and two π bonds constructed from the p orbitals perpendicular to the σ bond. However, the traditional textbook triple bond between two Al atoms has remained elusive. Here we report an Al≡Al triple bond in the designer Na₃Al₂⁻cluster predicted in silico, which was subsequently generated by pulsed arc discharge followed by mass spectrometry and photoelectron spectroscopy characterizations. Being effectively Al²⁻due to the electron donation from Na, the Al atoms in Na₃Al₂⁻undergo a double electronic transmutation into Group 15 elements, thus the Al²⁻≡Al²⁻kernel mimics the P≡P and N≡N molecules. We anticipate this work will stimulate more endeavors in discovering materials using Al²⁻≡Al²⁻as a building block in the gas phase and in the solid state.

    

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5. Realization of an Al≡Al Triple Bond in the Gas‐Phase Na 3 Al 2 − Cluster via Double Electronic Transmutation

   https://doi.org/10.1002/ange.201806917  

   Zhang, Xinxing ; Popov, Ivan A. ; Lundell, Katie A. ; Wang, Haopeng ; Mu, Chaonan ; Wang, Wei ; Schnöckel, Hansgeorg ; Boldyrev, Alexander I. ; Bowen, Kit H. ( September 2018 , Angewandte Chemie)

   The discovery of homodinuclear multiple bonds composed of Group 13 elements represents one of the most challenging frontiers in modern chemistry. A classical triple bond such as N≡N and HC≡CH contains one σ bond and two π bonds constructed from the p orbitals perpendicular to the σ bond. However, the traditional textbook triple bond between two Al atoms has remained elusive. Here we report an Al≡Al triple bond in the designer Na₃Al₂⁻cluster predicted in silico, which was subsequently generated by pulsed arc discharge followed by mass spectrometry and photoelectron spectroscopy characterizations. Being effectively Al²⁻due to the electron donation from Na, the Al atoms in Na₃Al₂⁻undergo a double electronic transmutation into Group 15 elements, thus the Al²⁻≡Al²⁻kernel mimics the P≡P and N≡N molecules. We anticipate this work will stimulate more endeavors in discovering materials using Al²⁻≡Al²⁻as a building block in the gas phase and in the solid state.

    

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